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Element geochemistry and neodymium isotope systematics of the Neoarchean banded iron formations in the Qingyuan greenstone belt, North China Craton
Peng, Zidong1,2,3; Wang, Changle1,2,3; Tong, Xiaoxue1,2,3; Zhang, Lianchang1,2,3; Zhang, Banglu1,2,3
2018-11-01
Source PublicationORE GEOLOGY REVIEWS
ISSN0169-1368
Volume102Pages:562-584
AbstractPure marine chemical sediments, such as banded iron formations (BIF), are excellent archives of ancient seawater and may also provide constraints on the coeval hydrosphere-atmosphere system. However, on the bases of interpreted depositional settings, it has long been argued that Algoma type BIF merely recorded the intrabasinal volcanic or hydrothermal conditions. Here we couple systematic major and trace elements data with samarium (Sm)-neodymium (Nd) isotopic analyses of similar to 2.56 Ga old Algoma type BIFs and associated schists from different stratigraphic horizons of the Qingyuan greenstone belt (QGB) in the North China Craton (NCC) to characterize the source and depositional environment over a short period (similar to 30 Ma). Meanwhile, we also compare our results with data for other Archean to Paleoproterozoic Superior- and Algoma-type BIFs, especially those near-contemporaneous counterparts in the NCC, to further evaluate the reliability of QGB BIFs as proxies for the Neoarchean seawater. Low Al2O3 (< 1.0 wt%) and high field strength elements (HFSE; e.g., Zr, Hf, and Th) contents (< 1 ppm) for most BIF samples indicate an essentially detritus-free depositional environment. Shale-normalized rare earth elements and yttrium (REE + Y) patterns of these chemically pure BIF samples display features characteristic of modem seawater, with positive La anomalies, superchondritic Y/Ho ratios, and HREE enrichment relative to LREE. The presence of distinctly positive Eu anomalies indicates a significant high-T hydrothermal input, while the slightly wide range of Eu/Sm ratios likely imply plausible contributions from low-T hydrothermal fluids or changing intensities of hydrothermal activity. Moreover, similar to other Neoarchean Algoma type BIFs in the NCC (e.g., the Anshan-Benxi and the eastern Hebei BIFs), the absence of negative Ce anomalies in combination with the narrow range of Pr/Yb-SN ratios for all samples suggest that water columns from which these BIFs deposited were anoxic. The initial epsilon(Nd) values of the purest BIF samples (the most reliable archives for the Neoarchean QGB seawater) range between +0.8 and +3.6, lower than those of associated schists (+3.6 to +3.8) and coeval basalts (+2.8 to +4.3), indicating the existence of isotopically enriched or less depleted protocrustal landmasses (characterized by negative or obviously lower epsilon(Nd) values) which contributed materials to ambient seawater in the QGB basin. Significantly, the large similarity in depositional environment for all the Algoma type BIFs in the NCC, as well as the relatively consistent REY patterns for both Algoma and Superior types BIFs of Archean to Paleoproterozoic ages suggest that the QGB BIFs can be used reliably as Neoarchean seawater proxies.
KeywordTrace and major elements Sm-Nd isotope BIF, Neoarchean, Qingyuan greenstone belt NCC
DOI10.1016/j.oregeorev.2018.09.008
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
WOS KeywordRARE-EARTH-ELEMENTS ; GA PONGOLA SUPERGROUP ; ANSHAN-BENXI AREA ; TRACE-ELEMENT ; ND ISOTOPE ; TRANSVAAL SUPERGROUP ; SUPRACRUSTAL ROCKS ; OCEAN CIRCULATION ; PILBARA CRATON ; CRUSTAL GROWTH
Language英语
Funding ProjectNational Natural Science Foundation of China[41572076] ; National Natural Science Foundation of China[41602085] ; National Natural Science Foundation of China[41872087] ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China[KLMR2017-18]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China ; Open Research Project of Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
WOS Research AreaGeology ; Mineralogy ; Mining & Mineral Processing
WOS SubjectGeology ; Mineralogy ; Mining & Mineral Processing
WOS IDWOS:000453493100027
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90268
Collection矿产资源研究院重点实验室
Corresponding AuthorWang, Changle; Zhang, Lianchang
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Peng, Zidong,Wang, Changle,Tong, Xiaoxue,et al. Element geochemistry and neodymium isotope systematics of the Neoarchean banded iron formations in the Qingyuan greenstone belt, North China Craton[J]. ORE GEOLOGY REVIEWS,2018,102:562-584.
APA Peng, Zidong,Wang, Changle,Tong, Xiaoxue,Zhang, Lianchang,&Zhang, Banglu.(2018).Element geochemistry and neodymium isotope systematics of the Neoarchean banded iron formations in the Qingyuan greenstone belt, North China Craton.ORE GEOLOGY REVIEWS,102,562-584.
MLA Peng, Zidong,et al."Element geochemistry and neodymium isotope systematics of the Neoarchean banded iron formations in the Qingyuan greenstone belt, North China Craton".ORE GEOLOGY REVIEWS 102(2018):562-584.
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